修改MySQL密码：

复制代码 代码如下:

mysqladmin -u root -p password 123456

mysqladmin -u用户名 -p旧密码 password 新密码

忘记MySQL密码：

复制代码 代码如下:

chown -R mysql:mysql /var/lib/mysql

/etc/init.d/mysql stop 或 kill -9 杀死进程。

[root@corshetlpro01 bin]# cd /usr/local/mysql/bin

./mysqld_safe --user=mysql --skip-grant-tables --skip-networking &

[root@corshetlpro01 bin]# ps -ef | grep mysql

root 26544 25356 0 15:08 pts/18 00:00:00 /bin/sh ./mysqld_safe --user=mysql --skip-grant-tables --skip-networking

mysql 26673 26544 0 15:08 pts/18 00:00:00 /usr/local/mysql/libexec/mysqld --basedir=/usr/local/mysql --datadir=/var/lib/mysql --user=mysql --skip-grant-tables --skip-networking --log-error=/var/lib/mysql/corshetlpro01.err --pid-file=/var/lib/mysql/corshetlpro01.pid --socket=/tmp/mysql.sock --port=3306

root 27223 25356 0 15:08 pts/18 00:00:00 grep mysql

./mysql -u root

mysql> use mysql;

mysql> update user set password=password('newpassword') where user='root';

mysql> flush privileges;

mysql> quit

# /etc/init.d/mysql restart

# mysql -uroot -p

enter password: <输入新设的密码newpassword>